# fileName = 'birthday.txt'
# try:
#     file = open(fileName,'r')
# except FileNotFoundError:
#     print(fileName,'文件不存在')
# else:
#     print(fileName,'文件有',len(file.readlines()),'行')
#     file.close()


fileName = 'integer.txt'
try:
    file = open(fileName,'a')
    data = int(input('请输入一个整数：'))
    file.write(str(data))
except Exception as e:
    print(e)
finally:
    print('关闭文件')
    file.close()